Hazardous Tree Assessment and Removal

Not always. Long-standing lean differs from recent movement. Root condition, trunk defects, crown balance, soil changes and targets need assessment.

Cabling or bracing may reduce certain movement, but it is not a guarantee and requires inspection and maintenance.

No tree is risk-free. A qualified assessment documents observable conditions, targets and reasonable management options at that time.

Fresh cracks, new lean, moving soil, hanging limbs, major dead sections, repeated failures and damage near occupied targets deserve timely professional review.

No single feature determines the answer. The amount and location of sound wood, crown condition, roots, loading and what the tree could strike all matter.

Written reporting can be requested when needed for a sale, dispute, construction plan or management decision. Confirm the required detail and intended use before the visit.

Three things together, never one alone: the likelihood that a part fails, the likelihood it strikes something if it does, and how bad that strike would be. A hollow trunk over an unused corner of a field scores low. The same hollow over a driveway where a car is parked every night scores high. That is why two trees in identical condition can get opposite recommendations, and why "is this tree dangerous?" cannot be answered without knowing what is underneath it.

The working rule most assessors start from is that a trunk retaining roughly a third of its radius as sound wood around the full circumference has meaningful strength left, because a hollow tube resists bending far better than intuition suggests. But that rule assumes the shell is continuous. An open cavity, a seam, or a crack through the shell changes the calculation completely, and so does a lean that loads one side. It is a starting point for measurement, not a verdict.

It depends entirely on which fungus, because the fruiting body is the visible part of decay that has already been working for years. Some species decay only the dead heartwood and leave a stable shell; others attack the roots and the base, which is where failure is sudden and total. A bracket at the root collar deserves a prompt look. Photograph it before it deteriorates — the shape, colour, pore surface and exact position are what allow identification.

Not necessarily, but cracks are the defect worth taking most seriously because they indicate the wood has already failed somewhere. What matters is depth, orientation and whether it is moving. A shallow frost crack in bark is common here and often benign. A crack running vertically into a union, or one that visibly opens and closes as the tree moves in wind, means the section is separating and has no reliable reserve.

Sometimes, and it is worth asking. Reducing the end weight on an over-extended limb, removing a co-dominant stem, or crown-reducing a top-heavy tree can lower the load enough to change the risk. What cannot be pruned away is a compromised root plate, a decayed base, or a crack through the main stem — those are structural, and taking weight off does not restore what is already broken.

For a mature tree over a house, driveway or play area, once every one to three years is reasonable, plus a look after any storm that was locally severe. That cadence exists because the changes that matter — a new crack, a lifted root plate, a dying top — appear between inspections and are easy to miss from the ground when you see the tree every day.

No, and this is the single most common false alarm. A tree that has leaned the same way for twenty years has grown reaction wood to hold that position and is often stable. What matters is whether the lean is new or increasing. Look at the ground on the high side for cracked or lifted soil, and at the low side for a mound. A lean with disturbed soil is a different situation from a lean with undisturbed turf and moss growing right up to the trunk.

Prior notice is what changes the answer. An apparently healthy tree that falls in a storm is generally treated as an act of nature. A tree you had been told was defective, and did nothing about, is a different matter, because you knew and had the opportunity to act. That is a practical reason to get a written assessment when a tree worries you and to keep it, whichever way the recommendation goes.

No honest assessor will write that, and you should be wary of one who offers to. What a written assessment says is what was observable on a given date, what the likely failure modes are, what the targets are, and what management options are reasonable — with a review interval. No tree is risk-free, decay is largely internal, and conditions change; a report is a dated professional opinion, not a guarantee.